Sectional plastic step.



Patented Fb. 4, 1919.

B. A. STEWART SECTIONAL PLASTIC STEP.

I APPLICATION F|-LED APR-10| 1917- 1,293,233.

WITNESSES:

ATTORN Ys.

n.: mmm: Penas cav, pn-nunw., wAsmNcroN. u c.

BURDICK A. STEWART, vOF PITTSFIELD, MASSACHUSETTS.

SECTIONAL PLASTIC STEP.

Application filed April 10. 1917.

To all whom t 'may concern.'

Be it known that I, BURDICK A. STEWART, a citizen of the United States, residing at Pittsfield, in the county of Berkshire and State of Massachusetts, have invented certain new and useful Improvements in Sectional Plastic Ste-ps, of which the following is a specification.

This invention relates to sectional plastic steps and concerns an improved method of constructing and assembling the same.

A principal object is the provision of steps constructed of separately formed parts susceptible of manufacture in quantity, as standardized stock articles for trade and commerce. A further object is the provision of steps which may be assembled for use, or disassembled for repairs, without the need of skilled labor or special tools.

Referring to the accompanying drawings wherein I have illustrated the above described method of constructing concrete steps and a preferred form of embodiment thereof, Y

Figure l is a front elevation of a series of concrete steps assembled for use;

Fig. 2, a vertical section of the same on 'the line A- -A of Fig. 1;

Fig. 3, a detail section embracing a portion of one of the upright supports, showing the form and arrangement of one of the pockets or recesses for the studs;

Fig. 4, an edge View of the portion of the upright support shown in Fig. 3;

Fig. 5, a bottom view of one of the stud sockets provided in the lower face, and

Fig. 6, a plan side view of the same.

As shown, the step in assembly forms a hollow unitary structure formed of separate plastic slabs detachably secured together and constructed of preferably solid concrete previously prepared in suitable molds provided for the purpose. The structure com` prises a series of alternate risers 6,7, etc., and treads 4, 5, etc., fitted to oppositely arranged upright supports forming end-pieces 1, 3, and an intermediate support 2. The top tread 4 forms an extended platform, preferably wider than the lower treads, in conformity with the usual practice.

The several treads and risers are serially connected in detachable relation to each other by removable rods 21, and are independently connected by rods or studs 13 to the upright supports 1, 2, 3, the rear margin Specification of Letter`s1atent.l

-1 atented Feb. 4., 191e. Serial No. 160,949.

of each tread being extended under and secured to the overlying riser. Although each piece may be separately attached and detached to the upright supports independently of the remaining pieces, in assembling the usual and preferred practice is to attach the pieces in regular order, commencing with the lowest riser 7. The studs 13 securing this part, like the remaining risers 6, 6, to the upright supports, carry on their rear or lower endsanut 15 andA terminate in lateral pockets 16 opening on one side of the upright supports. The pockets 16 communicate by a suitable bore 22, extended centrally through the body of the upright supports, with metallic sockets 10 embedded on the inner face of the risers. These sockets 10 are set in rigid position in the concrete and have a flanged head 23 which prevents displacement, and a threaded central recess 24 to receive one end of the studs 13, which are also threaded.

The rods 21 securing the treads and risers together are constructed similar to the studs 13, carrying at their lower ends a nut 1l and terminating at their upper ends in a socket 9, similar to the socket 10, above described, said rods being extended through a suitable opening provided centrally vertically through the riser and transversely through the rear end of the tread.

I have further shown and preferably pro vide a horizontally arranged tie-piece 8 in the rear, similar in formation to the risers, said tie-piece being bolted to the top tread 4l by a series of rods 18, secured in the manner of the rods 21, and to the upright supports 1, 2, 3, by studs 13. This tie-piece is designed to strengthen the frame work of the structure by securing the upright supports in rigid position in the rear.

The lower riser 7, and preferably also the tie-piece 8, is provided on its lower edge with suitable recesses 17 for the reception of the nuts 11 on the rods 21.

While I have illustrated the use of an intermediate or auxiliary upright support 2, it will be understood that the use of this additional support is not necessary in steps of short length.

I claim:

A sectional plastic step comprising oppositely arranged upright supports having lateral pockets therein; treads and risers serially arranged on said supports, each of said risers being arranged for support on terminating in saiol pockets, and securing the rear margin of the underlying tread; members carried on the rods 1n said pockets. 10 and securing means for locking the several ln testimony whereof I hereunto aix my sections .together 1n detachable relation and. signature in presence of tWo Witnesses.

comprislng metallic sockets seated in the BURDICK A. STEWART. treads and risers, rods secured at one end Witnesses:

in said sockets and projecting at the op- JN0. J. WHITTLESEY,

posite end into the upright supports and. JOSEPH M. MCMAHON.

Gopies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

